These birds can reach 76–86 cm (29.9-33.9 inches) long and weigh 900 to 1300 g (2-3 lbs). They are vivid in appearance with blue wings and tail, dark blue chin, golden under parts and a green forehead. Beaks are black, and very strong for crushing nuts. The naked face is white, turning pink in excited birds, and lined with small black feathers.

There is little variation in plumage across the range. Some birds have a more orangey or "butterscotch" underside color, particularly on the breast. This was often seen in Trinidad birds and others of the Caribbean area, and appears to be due to environmental factors.[citation needed] The Blue-and-yellow Macaw uses its powerful beak for breaking nutshells, and also for climbing up and hanging from trees.

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